So, I am going to summarize some of the arguments being presented and try to deal with them in an even handed and general way. I think a lot of this has to do with art and how we see it, and perhaps to a degree some misconceptions on what art is and why it even applies to this conversation.
Spoiler for length. I find myself agreeing with nearly all of @firesnakearies' points. [ as I tend to do unless we are talking about rulesets -- how can someone who is so right about about so much be wrong about 5e?
] If anything this only an adjunct / additional angle to the points they have made.
Likewise with @distant stranger I am torn between my desire to agree because with the points made because they were made so eloquently and, well, the fact that disagree with some of your points so profoundly.
On this point about Davinci:
None of it matters. The only importance in such a matter arises from our interest in him, it can become important but only when he is important to us -and perhaps not on even then. One's sexuality is but the smallest facet of whom they are as a person, the least part of a compelling whole.
Let's agree that it matters when we are interested in him. We get to see the man behind the mask and both of your examples -- the man of the people who upset his patrons, the person who partook in the decadence of renaissance Italian. But it also helps us understand the time that much better. Why did zealots like Savonarola burn painting in large bonfires? What, in Savonarola's mind, was the connection between art, decadence and corruption? Knowing that the famed painter was caught in vice raid helps that. I also helps me understand the deep sensuality of his portrait of John the Baptist. Knowing the painter was thirsting helps me interpret the artwork that much better.
In terms of the game the authors seem to be going for the "man behind the mask" Wyll, the folk hero, has a dark secret. You, his confidant, get a peek and the man behind the mask and can pledge to free him from his bonds. Wyll has a unique model and you can see the results of Spike's torture when he removes his shirt. Nudity is revealing -- his story is written on his body and when he naked before the main character he is vulnerable.
This is even more true of Astarian since his scars literally take the form of words. He is a seducer, one who doesn't even remove his mask in the bedroom, someone who is capable of appearing clothed even while naked. But we see the mask slip the next morning. We seem him basking in the sunlight and we touch a sensitive spot when we notice the scars. Astarian is someone who is -- quite literally -- incapable of looking the in mirror. Without his master he's lost, perhaps he will come to understand himself when he sees himself reflected in Tav's eyes.
Both romances move the story forward and makes the associated quests a bit deeper than Mario-princess story or Cazador as an end boss.
So I want to dial up the romance. I want more interactions, more conversations and more text. (and I know this Larian and not J.E. Sawyer but please give me a wall of text. Letters? Diary entries? A literal wall with writing on it?)